Generation Dead by Daniel Waters

Generation Dead
392 pages; Hyperion
All of a sudden, teens who have died are coming back to life. Oakvale High is one of the only high schools that allows "differently biotic" (DB) students to attend. When Phoebe, a typical high school girl, becomes attracted to a DB boy, she faces criticism and hostility from her family and peers. Can the living and the dead coexist?